SU1222475A1 - Clamping fixture,mainly for welding non-rotatory pipe joints - Google Patents

Description

The invention relates to a machine construction, in particular to auxiliary equipment for assembly and welding works, and can be used, in particular, for fastening automatic welding machines when welding not rotary joints of pipes of different diameters.

The aim of the invention is to increase the structure by using a single actuator for clamping and re-adjusting the device and ensuring a stable position of the center of the pipe relative to the body.

FIG. 1 shows the clamping device, general view; in fig. 2 - kinematic connection of the screw with the handle.

The device includes a housing 1 with a driving screw 2 with right and left threads, carrying nuts 3 and 4. Nut 3 is made integral with a prismatic clamping sponge 5, and nuts 4 are integral with a hollow clamping sponge 6 provided with a support shoulder 7 for a spring 8 ,, placed in the cavity of the sponge 6 The drive handle -9 is filled with a cavity 10 in which the drive 11 of the faceplate rotation (not shown) is placed and the guide 12, on which the handle 9 is fixed through the bearings 13. The cylindrical surface of the handle 9 has gear cut 14, entering in engagement with the gear 15 mounted on the shank of the screw 2.

In case 1 parallel to screw 2, a guide 16 is mounted, a prismatic clamping sponge S is mounted on it. In the sponge 6 having a shoulder 17, an additional nut 19 is placed between the plane 18 of the nut 4 and the shoulder 7, preloaded by the elastic element 8. On the case 1 the left 20 and right 21 stops

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The ratio t) / is chosen equal to Sinet, where IV is the angle between the base surfaces of the prism, ii is the thread pitch of the nut of the hollow sponge, t- is the thread pitch of the nut of the prismatic sponge. This ratio of the angle and pitch of the threads allows the points of contact of the clamping jaws 5 and 6 with the pipe 22 to move by the same distance from the axis of the pipe 22, ensuring a stable position of the center of the pipe relative to the casing.

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The device works as follows.

To adjust the device to the desired (smaller) diameter of the clamping pipes, rotate the knob 9 on the bearings 13. Through the gear thread 14 and gear 15 rotates the rotation to screw 2. Nuts 3 and 4, hence, prismatic lip 5 and floor the sponge 6 is moved along the screw 2 towards each other. Sponge 6 first rotates with screw 2 to left stop 20, and then begins to move with nut 4 upward along screw 2. Nut 4 moves along the thread of screw 2 all the way into additional nut 19 and then moves with it upwards. The sponges 5 and 6 move towards each other to a size slightly smaller than the diameter of the clamped tubes 22. Then rotate the handle 9 in the opposite direction and disengage the jaws 5 and 6 to a size larger than the clamped tubes 22. The sponge 6 will first turn to the stop to the right the stop 21 and then will move down. When moving the jaw 6, only the nut 4 moves down, and the nut 19 remains in place. Between the plane 18 of the nut 4 and the end of the additional nut 19, a guaranteed gap is formed which allows only the nut 4 to move when the pipe of the required diameter is clamped. The nut 19 remains in place. In order to clamp the device on the pipe 22, the screw 2 is rotated with the same handle 9. The jaws 6 and 5 move towards each other and clamp the pipe 22. The sponge 6 first rotates up to the stop 20, and then begins to move along the screw 2 up to the stop into the pipe 22. Rotate the jaws 6 until the stops 20 and 21 are realized by increasing the frictional forces in the thread of the nut 4 while compressing the spring 8.

The constant lagging value during the hollow clamping jaw 6 relative to the prismatic clamping jaw 5 resulting from the rotation of the jaw 6 from the lug 20 to the lug 21 at the start of rotation of the screw 2 is compensated for by the initial setting of the jaw 6 by the lagging value. Thus, the body is clamped on the pipe 22. After welding, the device

removed from the pipe 22, for which they rotate the handle 9 so that the jaws 5 and 6 diverge.

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When adjusting the device to a larger diameter, pipes 22 rotate the handle in the same direction. In this case, the nuts 3 and 4 are moved in different directions. When moving the nut 4 and the jaw 6 down, the collar 17 rests on the nut 19 and moves it to the position needed to clamp the pipe 2224754

. would have a larger diameter. Next, the clamping process is repeated.

Due to the fact that inside the hollow clamping jaw, this additional clamping device is spring-loaded relative to it and has a simpler structure due to the use of the same drive for clamping and readjustment compared to the basic version.

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Editor R. Tsitsika

Compiled by S. Kul vtsev Tehred I. Popovich

Order 1650/14

Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch P1P Patent, Uzhgorod, st. Project, 4

Proofreader A. Obruchar

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Claims (2)

1. CLAMPING DEVICE ADVANTAGES WHEN WELDING PERMANENT PIPE JOINTS, containing a drive screw for reconfiguring the device with right and left threads at the ends, a guide, nuts mounted on the screw with clamping jaws, one of which is prismatic and mounted on the guide, and the other made hollow, and a drive handle for clamping, characterized in that, in order to simplify the design by using a single drive to clamp and readjust the device, it is equipped with an additional nut th mounted on the screw housed inside a hollow sponge with the ability to interact with it and spring-loaded relative to said jaws, wherein the sponge is adapted Polay to the limiting collar for extra nut and the housing are fixed hollow stops for the clamping jaw. 2. The device according to π. 1, characterized in that, in order to ensure a stable position of the center of the pipe relative to the body, the ratio of the thread pitch of the nut of the hollow sponge to the thread pitch of the prismatic sponge is made equal to sin where is the angle between the base surfaces of the prismatic sponge. I